Filioque Explained

This is my visual diagram of the procession: https://freeimage.host/i/3rBq0GI

Here is a concise explanation of the Holy Trinity from the bull of union with the Copts from the ecumenical council of Florence: 

"First, then, the holy Roman church, founded on the words of our Lord and Saviour, firmly believes, professes and preaches one true God, almighty, immutable and eternal, Father, Son and holy Spirit; one in essence, three in persons; unbegotten Father, Son begotten from the Father, holy Spirit proceeding from the Father and the Son; the Father is not the Son or the holy Spirit, the Son is not the Father or the holy Spirit, the holy Spirit is not the Father or the Son; the Father is only the Father, the Son is only the Son, the holy Spirit is only the holy Spirit. The Father alone from his substance begot the Son; the Son alone is begotten of the Father alone; the holy Spirit alone proceeds at once from the Father and the Son. These three persons are one God not three gods, because there is one substance of the three, one essence, one nature, one Godhead, one immensity, one eternity, and everything is one where the difference of a relation does not prevent this. Because of this unity the Father is whole in the Son, whole in the holy Spirit; the Son is whole in the Father, whole in the holy Spirit; the holy Spirit is whole in the Father, whole in the Son. No one of them precedes another in eternity or excels in greatness or surpasses in power. The existence of the Son from the Father is certainly eternal and without beginning, and the procession of the holy Spirit from the Father and the Son is eternal and without beginning. Whatever the Father is or has, he has not from another but from himself and is principle without principle. Whatever the Son is or has, he has from the Father and is principle from principle. Whatever the holy Spirit is or has, he has from the Father together with the Son. But the Father and the Son are not two principles of the holy Spirit, but one principle, just as the Father and the Son and the holy Spirit are not three principles of creation but one principle. Therefore it condemns, reproves, anathematizes and declares to be outside the body of Christ, which is the church, whoever holds opposing or contrary views. Hence it condemns Sabellius, who confused the persons and altogether removed their real distinction. It condemns the Arians, the Eunomians and the Macedonians who say that only the Father is true God and place the Son and the holy Spirit in the order of creatures. It also condemns any others who make degrees or inequalities in the Trinity.

"Most firmly it believes, professes and preaches that the one true God, Father, Son and holy Spirit, is the creator of all things that are, visible and invisible, who, when he willed it, made from his own goodness all creatures, both spiritual and corporeal, good indeed because they are made by the supreme good, but mutable because they are made from nothing, and it asserts that there is no nature of evil because every nature, in so far as it is a nature, is good. It professes that one and the same God is the author of the old and the new Testament — that is, the law and the prophets, and the gospel — since the saints of both testaments spoke under the inspiration of the same Spirit. It accepts and venerates their books, whose titles are as follows."

Source for quotation: https://www.papalencyclicals.net/councils/ecum17.htm